Community fears have been mounting after police arrested 28-year-old Clayton Courtney on May 4 after he allegedly stabbed his roommate and threatened the roommate's pregnant girlfriend. Investigators learned Courtney said before the altercation he had killed three people that night.

Officers discovered Courtney's 21-year-old girlfriend, Brittany Cross, dead behind a former furniture store the next morning. Police Chief David Moore said Cross died of a blunt-force head injury.

On Friday, a 15-year-old boy discovered the body of 75-year-old Mary Coulthard in the Rock River. She had been missing since May 3. Police said there no obvious signs of trauma on the body. An autopsy determined the cause of death was drowning.

Police called a 2 p.m. news conference Monday to address what they called "separate issues" on their website.

Moore said that Mary Coulthard suffered a separate injury prior to her drowning. He said the evidence does not indicate whether it was suicide, an accident or a criminal act.

Gerald Hockensmith, who had been reported missing from the area, was located Monday morning in northern Wisconsin and is safe.

Courtney remains in the Rock County Jail on $100,000 cash bail. He faces multiple charges including attempted homicide, attempted arson and reckless endangerment, in connection with the stabbing incident.

Investigators believe that prior to the stabbing Courtney tried to set a car on fire and went into a rage, during which he said "I've already killed three people tonight" and "We are all going to die."

He also said before the fight he was going to drink and do drugs with a woman under a Rock River bridge. His comments prompted officers to search the bridge area, leading to the discovery of Cross' body.